Tehran: Iran's parliament speaker Mohammad Bagher Ghalibaf said Sunday that the United States was plotting a ground attack despite publicly engaging in diplomatic efforts aimed at ending the war.

"The enemy publicly sends messages of negotiation and dialogue while secretly planning a ground attack," Ghalibaf said in a statement carried by the official IRNA news agency.

"Our men are waiting for the arrival of the American soldiers on the ground to set them on fire and punish their regional allies once and for all," he added.

Ghalibaf's defiant message comes after one month of regional war that was sparked on February 28 when Israel and the United States launched air strikes on Iran, killing its supreme leader and triggering a conflict that has spread across the Middle East.

Shipping traffic in the vital Strait of Hormuz, through which 20 percent of the world's crude oil and liquefied natural gas normally passes, has been brought to a near-standstill by the conflict.

Ghalibaf called for unity among Iranians, saying the country was in "a major global war" that was "at its most critical stage".

"We are certain that we can punish the United States, make it regret attacking Iran, and firmly secure our legitimate rights," he said.

US and Israeli attacks on Iran have driven up prices, darkened the outlook for the world economy, sent global stock markets reeling and forced developing countries to ration fuel and subsidize energy costs to protect their poorest.

Ongoing strikes and counterstrikes on Persian Gulf refineries, pipelines, gas fields and tanker terminals threaten to the prolong the global economic pain for months, even years.

“A week ago or certainly two weeks ago, I would have said: If the war stopped that day, the long-term implications would be pretty small,’’ said Christopher Knittel, an energy economist at the Massachusetts Institute of Technology. “But what we’re seeing is infrastructure actually being destroyed, which means the ramifications of this war are going to be long-lived.’’